<?php  
  
  
/** 
* Author : smallchicken 
* Time   : 2009年6月8日16:46:05 
* mode 1 : 强制裁剪，生成图片严格按照需要，不足放大，超过裁剪，图片始终铺满 
* mode 2 : 和1类似，但不足的时候 不放大 会产生补白，可以用png消除。 
* mode 3 : 只缩放，不裁剪，保留全部图片信息，会产生补白， 
* mode 4 : 只缩放，不裁剪，保留全部图片信息，生成图片大小为最终缩放后的图片有效信息的实际大小，不产生补白 
* 默认补白为白色，如果要使补白成透明像素，请使用SaveAlpha()方法代替SaveImage()方法 
* 
* 调用方法： 
* 
* $ic=new ImageCrop('old.jpg','afterCrop.jpg'); 
* $ic->Crop(120,80,2); 
* $ic->SaveImage(); 
*        //$ic->SaveAlpha();将补白变成透明像素保存 
* $ic->destory(); 
* 
* 
*/  
class ImageCrop{  
  
var $sImage;  
var $dImage;  
var $src_file;  
var $dst_file;  
var $src_width;  
var $src_height;  
var $src_ext;  
var $src_type;  
  
function ImageCrop($src_file,$dst_file=''){  
$this->src_file=$src_file;  
$this->dst_file=$dst_file;  
$this->LoadImage();  
}  
  
function SetSrcFile($src_file){  
$this->src_file=$src_file;  
}  
  
function SetDstFile($dst_file){  
$this->dst_file=$dst_file;  
}  

//png2jpg  
function png2jpg($srcPathName, $delOri=true)  
{  
    $srcFile=$srcPathName;  
    $srcFileExt=strtolower(trim(substr(strrchr($srcFile,'.'),1)));  
    if($srcFileExt=='png')  
    {  
        $dstFile = str_replace('.png', '.jpg', $srcPathName);  
        $photoSize = GetImageSize($srcFile);  
        $pw = $photoSize[0];  
        $ph = $photoSize[1];  
        $dstImage = ImageCreateTrueColor($pw, $ph);  
        imagecolorallocate($dstImage, 255, 255, 255);  
        //读取图片  
        $srcImage = ImageCreateFromPNG($srcFile);  
        //合拼图片  
        imagecopyresampled($dstImage, $srcImage, 0, 0, 0, 0, $pw, $ph, $pw, $ph);  
        imagejpeg($dstImage, $dstFile, 90);  
        if ($delOri)  
        {  
            unlink($srcFile);  
        }  
        imagedestroy($srcImage);  
    }  
}    
function LoadImage(){  
list($this->src_width, $this->src_height, $this->src_type) = getimagesize($this->src_file);  
switch($this->src_type) {  
case IMAGETYPE_JPEG :  
$this->sImage=imagecreatefromjpeg($this->src_file);  
$this->ext='jpg';  
break;  
case IMAGETYPE_PNG :  
$this->sImage=imagecreatefrompng($this->src_file);  
$this->ext='png';  
break;  
case IMAGETYPE_GIF :  
$this->sImage=imagecreatefromgif($this->src_file);  
$this->ext='gif';  
break;  
default:  
exit();  
}  
}  
  
function SaveImage($fileName=''){  
$this->dst_file=$fileName ? $fileName : $this->dst_file;  
switch($this->src_type) {  
case IMAGETYPE_JPEG :  
imagejpeg($this->dImage,$this->dst_file,60);  
break;  
case IMAGETYPE_PNG :  
imagepng($this->dImage,$this->dst_file);  
break;  
case IMAGETYPE_GIF :  
imagegif($this->dImage,$this->dst_file);  
break;  
default:  
break;  
}  
}  
  
function OutImage(){  
switch($this->src_type) {  
case IMAGETYPE_JPEG :  
header('Content-type: image/jpeg');  
imagejpeg($this->dImage);  
break;  
case IMAGETYPE_PNG :  
header('Content-type: image/png');  
imagepng($this->dImage);  
break;  
case IMAGETYPE_GIF :  
header('Content-type: image/gif');  
imagegif($this->dImage);  
break;  
default:  
break;  
}  
}  
  
function SaveAlpha($fileName=''){  
$this->dst_file=$fileName ? $fileName . '.png' : $this->dst_file .'.png';  
imagesavealpha($this->dImage, true);  
imagepng($this->dImage,$this->dst_file);  
}  
  
function OutAlpha(){  
imagesavealpha($this->dImage, true);  
header('Content-type: image/png');  
imagepng($this->dImage);  
}     
  
function destory(){  
imagedestroy($this->sImage);  
imagedestroy($this->dImage);  
}  
  
function Crop($dst_width,$dst_height,$mode=1,$dst_file=''){  
if($dst_file) $this->dst_file=$dst_file;  
$this->dImage = imagecreatetruecolor($dst_width,$dst_height);  
  
$bg = imagecolorallocatealpha($this->dImage,255,255,255,127);  
imagefill($this->dImage, 0, 0, $bg);  
imagecolortransparent($this->dImage,$bg);  
  
$ratio_w=1.0 * $dst_width / $this->src_width;  
$ratio_h=1.0 * $dst_height / $this->src_height;  
$ratio=1.0;  
switch($mode){  
case 1:        // always crop  
if( ($ratio_w < 1 && $ratio_h < 1) || ($ratio_w > 1 && $ratio_h > 1)){  
$ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;  
$tmp_w = (int)($dst_width / $ratio);  
$tmp_h = (int)($dst_height / $ratio);  
$tmp_img=imagecreatetruecolor($tmp_w , $tmp_h);  
$src_x = (int) (($this->src_width-$tmp_w)/2) ;  
$src_y = (int) (($this->src_height-$tmp_h)/2) ;     
imagecopy($tmp_img, $this->sImage, 0,0,$src_x,$src_y,$tmp_w,$tmp_h);     
imagecopyresampled($this->dImage,$tmp_img,0,0,0,0,$dst_width,$dst_height,$tmp_w,$tmp_h);  
imagedestroy($tmp_img);  
}else{  
$ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;  
$tmp_w = (int)($this->src_width * $ratio);  
$tmp_h = (int)($this->src_height * $ratio);  
$tmp_img=imagecreatetruecolor($tmp_w ,$tmp_h);  
imagecopyresampled($tmp_img,$this->sImage,0,0,0,0,$tmp_w,$tmp_h,$this->src_width,$this->src_height);  
$src_x = (int)($tmp_w - $dst_width) / 2 ;  
$src_y = (int)($tmp_h - $dst_height) / 2 ;     
imagecopy($this->dImage, $tmp_img, 0,0,$src_x,$src_y,$dst_width,$dst_height);  
imagedestroy($tmp_img);  
}  
break;  
case 2:        // only small  
if($ratio_w < 1 && $ratio_h < 1){  
$ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;  
$tmp_w = (int)($dst_width / $ratio);  
$tmp_h = (int)($dst_height / $ratio);  
$tmp_img=imagecreatetruecolor($tmp_w , $tmp_h);  
$src_x = (int) ($this->src_width-$tmp_w)/2 ;  
$src_y = (int) ($this->src_height-$tmp_h)/2 ;     
imagecopy($tmp_img, $this->sImage, 0,0,$src_x,$src_y,$tmp_w,$tmp_h);     
imagecopyresampled($this->dImage,$tmp_img,0,0,0,0,$dst_width,$dst_height,$tmp_w,$tmp_h);  
imagedestroy($tmp_img);  
}elseif($ratio_w > 1 && $ratio_h > 1){  
$dst_x = (int) abs($dst_width - $this->src_width) / 2 ;  
$dst_y = (int) abs($dst_height -$this->src_height) / 2;     
imagecopy($this->dImage, $this->sImage,$dst_x,$dst_y,0,0,$this->src_width,$this->src_height);  
}else{  
$src_x=0;$dst_x=0;$src_y=0;$dst_y=0;  
if(($dst_width - $this->src_width) < 0){  
$src_x = (int) ($this->src_width - $dst_width)/2;  
$dst_x =0;  
}else{  
$src_x =0;  
$dst_x = (int) ($dst_width - $this->src_width)/2;  
}  
  
if( ($dst_height -$this->src_height) < 0){  
$src_y = (int) ($this->src_height - $dst_height)/2;  
$dst_y = 0;  
}else{  
$src_y = 0;  
$dst_y = (int) ($dst_height - $this->src_height)/2;  
}  
imagecopy($this->dImage, $this->sImage,$dst_x,$dst_y,$src_x,$src_y,$this->src_width,$this->src_height);  
}  
break;  
case 3:        // keep all image size and create need size  
if($ratio_w > 1 && $ratio_h > 1){  
$dst_x = (int)(abs($dst_width - $this->src_width )/2) ;  
$dst_y = (int)(abs($dst_height- $this->src_height)/2) ;  
imagecopy($this->dImage, $this->sImage, $dst_x,$dst_y,0,0,$this->src_width,$this->src_height);  
}else{  
$ratio = $ratio_w > $ratio_h ? $ratio_h : $ratio_w;  
$tmp_w = (int)($this->src_width * $ratio);  
$tmp_h = (int)($this->src_height * $ratio);  
$tmp_img=imagecreatetruecolor($tmp_w ,$tmp_h);  
imagecopyresampled($tmp_img,$this->sImage,0,0,0,0,$tmp_w,$tmp_h,$this->src_width,$this->src_height);  
$dst_x = (int)(abs($tmp_w -$dst_width )/2) ;  
$dst_y = (int)(abs($tmp_h -$dst_height)/2) ;  
imagecopy($this->dImage, $tmp_img, $dst_x,$dst_y,0,0,$tmp_w,$tmp_h);  
imagedestroy($tmp_img);  
}  
break;  
case 4:        // keep all image but create actually size  
if($ratio_w > 1 && $ratio_h > 1){  
$this->dImage = imagecreatetruecolor($this->src_width,$this->src_height);  
imagecopy($this->dImage, $this->sImage,0,0,0,0,$this->src_width,$this->src_height);  
}else{  
$ratio = $ratio_w > $ratio_h ? $ratio_h : $ratio_w;  
$tmp_w = (int)($this->src_width * $ratio);  
$tmp_h = (int)($this->src_height * $ratio);  
$this->dImage = imagecreatetruecolor($tmp_w ,$tmp_h);  
imagecopyresampled($this->dImage,$this->sImage,0,0,0,0,$tmp_w,$tmp_h,$this->src_width,$this->src_height);  
}  
break;  
}  
}// end Crop  
  
  
}  
?>